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Archives of Civil and Mechanical Engineering, 2022
Qiangfei Qian +5 more
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Qiangfei Qian +5 more
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Structural And Multidisciplinary Optimization, 2021
H. N. Lopes, J. Mahfoud, R. Pavanello
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H. N. Lopes, J. Mahfoud, R. Pavanello
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Journal of Fluids Engineering, 1930
Abstract The natural frequency of machine parts as related to the noise problem in machine operation is discussed in a general manner. Vibration phenomena in disks and rings are described in detail, following which the author discusses the manner in which a gear vibrates at its natural frequency.
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Abstract The natural frequency of machine parts as related to the noise problem in machine operation is discussed in a general manner. Vibration phenomena in disks and rings are described in detail, following which the author discusses the manner in which a gear vibrates at its natural frequency.
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Natural hybridization: Frequency
1997Abstract As discussed in Chapter ], numerous investigators have used natural hybridiza tion as a tool for studying phenomena that may cause population divergence and speciation (i.e., the formation of ban-iers to reproduction; Barton and Charlesworth, 1984; Coyne and Barton, 1988; Hewitt, 1988; Barton and Hewitt, 1989).
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Journal of the Hydraulics Division, 1961
In order to explain magnetic frequency relationships, development of cumulative frequency curve and its statistical interpretation are discussed; from frequency curve, relation between magnitude and design period in years is derived; applicability of procedure is shown by sampling from 1023-yr period of tree-ring indexes.
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In order to explain magnetic frequency relationships, development of cumulative frequency curve and its statistical interpretation are discussed; from frequency curve, relation between magnitude and design period in years is derived; applicability of procedure is shown by sampling from 1023-yr period of tree-ring indexes.
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Natural Frequencies of a Railroad Track
Journal of Applied Mechanics, 1987The natural frequency of an infinite railroad track was first determined by Timoshenko as ωR = √k/m, where k is the constant for the massless Winkler foundation and m is the mass per unit length of the rail. The natural frequencies of the track are determined here by modeling the track as a beam resting on a 3-D inertial elastic layer. It is shown that
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Natural (low frequency) emissions
1993Such emissions can be of distinct origin; they may be triggered by external events, e.g. lightning discharges, produced by plasma instabilities or by internal geophysical processes, e.g. invasion of corpuscles. They originate preferentially in the magnetosphere.
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Frequency-Dependent Choice, Minority Advantages, and Frequency-Dependent Natural Selection
Evolution, 1977Frequency-dependent natural selection is potentially important both as a mode by which gene frequencies of populations change and also as a possible explanation of the genetic load paradox. If most alleles are maintained at equilibrium under a frequency-dependent mode such that they are selectively equivalent at equilibrium, then no load is felt by ...
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Natural Frequencies, an Approximation
2004Generally, when calculating the natural frequencies of complex dynamic linear systems the finite element analysis method is applied. However, it is good practice to first apply a method to approximately calculate the natural frequency of that system to get a feel for the value of the natural frequency.
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